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okay, so how does the clock ground in my 77 vette? Is it the clock casing? The clock works when I hook it up to a battery but will not keep running when I put it back in the cluster unless I ground the back to the battery ground
The center cluster metal housing gets it's ground(s) through pins marked 1 & 9 of the PCB connector
With PCB connector installed do a continuity test from the PCB connector pins 1 or 9 to the back of the clock housing.
If your gauges are installed properly this should ground the center cluster metal housing.
The center cluster metal housing gets it's ground(s) through pins marked 1 & 9 of the PCB connector
With PCB connector installed do a continuity test from the PCB connector pins 1 or 9 to the back of the clock housing.
If your gauges are installed properly this should ground the center cluster metal housing.
but doesn’t the inside of the clock ground to the clock housing itself? The clock works fine when it’s not in its housing when connected to a battery but when I put it back together and it’s housing and I put it in the bezel it doesn’t work. So my question is there’a ground from the clock guts to the housing I would think am I correct? And if so how does a ground to the housing the clock guts Are their pins from the clock guts to the clock housing?
Gary,
Look at the photo of the printed circuit board layout I provided, right photo.
The 12 pin connector is labeled with there respective circuit(s)
Pin #6 is a HOT ALWAYS +12vdc power supply from the CLK/LTR/CTSY 20 AMP fuse.
The clocks +12vdc is connected via PCB just like the photo on the left shows a single nut to clock threaded lug.
The clock also needs a ground, the metal case itself is the ground when the 12 pin connector is fully plugged in.
Pin #1 and pin #9 are both common chassis grounds.
Gary,
Look at the photo of the printed circuit board layout I provided, right photo.
The 12 pin connector is labeled with there respective circuit(s)
Pin #6 is a HOT ALWAYS +12vdc power supply from the CLK/LTR/CTSY 20 AMP fuse.
The clocks +12vdc is connected via PCB just like the photo on the left shows a single nut to clock threaded lug.
The clock also needs a ground, the metal case itself is the ground when the 12 pin connector is fully plugged in.
Pin #1 and pin #9 are both common chassis grounds.
. Yes thank you for the layout. I get what you’re saying but what I’m asking is the insides clock doesn’t that touch the metal case? Isn’t part of the clock guts touch the metal case which grounds it? Are there some pins or tabs or something that’s supposed to touch the metal case from the clock inside?
Yes,
The clocks movement is 1 assembly that includes a metal backing plate with 2 notched tabs extending from it.
The 2nd assembly is the clocks face and hands.
The 3rd assembly is metal backing mounting plate, that is what you see from the back side of the gauge cluster.
The backing plate is mounted to the gauge cluster housing by 2 screws.
The clocks face has 2 small metal tangs that fold over into the 2 notched tabs of the clocks movement backing plate.
When these tabs are folded over the clock assemble is 1.
When mounted to gauge cluster housing by the 2 screws it is grounded.
Here is a clock video by another forum member, it is 2 min. + but you can see the notched tabs and he uses one of them for a battery ground point.
Here is a e-bay link of a NOS 1977 clock, scroll through the photos and you can see the metal tangs from the clocks face folded over the clocks movements notched backing plate tabs. https://www.ebay.com/itm/39423186617...Bk9SR4Sl-6PkYA
Yes,
The clocks movement is 1 assembly that includes a metal backing plate with 2 notched tabs extending from it.
The 2nd assembly is the clocks face and hands.
The 3rd assembly is metal backing mounting plate, that is what you see from the back side of the gauge cluster.
The backing plate is mounted to the gauge cluster housing by 2 screws.
The clocks face has 2 small metal tangs that fold over into the 2 notched tabs of the clocks movement backing plate.
When these tabs are folded over the clock assemble is 1.
When mounted to gauge cluster housing by the 2 screws it is grounded.
Here is a clock video by another forum member, it is 2 min. + but you can see the notched tabs and he uses one of them for a battery ground point. https://www.youtube.com/watch?v=4SQECjm7XSg&t=136s
Here is a e-bay link of a NOS 1977 clock, scroll through the photos and you can see the metal tangs from the clocks face folded over the clocks movements notched backing plate tabs. https://www.ebay.com/itm/39423186617...Bk9SR4Sl-6PkYA
OK now I get it. Thank you so much for that. That helps out a lot appreciate it
clock ground
